Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82db9cc24555e46…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 16:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4c916f53fa682b09003ca851cf61c618 SHA-1: 80d8864c90e0f3fd35d3fc4078e53b5389073918 SHA-256: f82db9cc24555e46716e5b9471078f806a7eff1447e263becc0a39ed74c9a288
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple PDF files hosted on various domains, suggesting an attempt to distribute malware or conduct phishing. The ML classifier strongly indicated maliciousness, supporting these findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://anitt.in/ckfinder/userfiles/files/xisirorakagu.pdf In PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/80509492901.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/radonenanovobomerosube.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109021001593205.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/nigofetoxevomijexake.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/muxineribulomokujarowat.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5765a9dc3c0b23ef7b335f96fd00cb2f/ziwoduvixapudesidipas.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bsacpeot4c84glt8kdv5cltrim/7553491601.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/zebowibodeteva.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7652ef75a---dafowenokoges.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/femadoxajawuseza.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/38354587812.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/nasozituxemufagewezatiso.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/xovokodagukaju.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/setumekerof.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/zifefanazozizibo.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jitinewisa.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/wadizebeja.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/kurokewovovaloteludake.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/fapifunek.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/nodifunubomuvixi.pdfIn PDF document text
    • http://aurora-c.jp/files/files/lotijigatibijilemidufete.pdfIn PDF document text
    • https://esvigo.com/upload/files/21618008526.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/lisadiwiturokakenorodun.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///77111207804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nintendo+3ds+emulators+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 17404 bytes
SHA-256: 9a756030ad0e25b30d03f811a7074f2483a1e6ef1bcb85b7b45277079355204d
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 10764 bytes
SHA-256: a1bb3dbca0acadfdd32d44f0885d35e5b31888e81925a1bc4db98bbf0b7addcf
font_02_sfnt_off000129bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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